.page-about {
  --about-pad-x: clamp(16px, 4vw, 40px);
  --about-rail-w: 236px;
  --about-tl-pad: 30px;
  --about-tl-axis: 7px;
  display: block;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about [id] {
  scroll-margin-top: 112px;
}

.page-about .about-wrap {
  box-sizing: border-box;
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--about-pad-x);
}

/* ---------- 面包屑 ---------- */
.page-about > .breadcrumbs {
  box-sizing: border-box;
  max-width: var(--shell);
  margin: clamp(96px, 12vw, 136px) auto 0;
  padding-inline: var(--about-pad-x);
  font-family: var(--font-ui);
  font-size: 13px;
  letter-spacing: 0.04em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  padding-top: clamp(16px, 2.6vw, 30px);
  padding-bottom: clamp(36px, 5.4vw, 68px);
}

.page-about .about-hero__lede h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 5.6vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--lake);
}

.page-about .about-hero__intro {
  max-width: 36em;
  margin: clamp(14px, 2vw, 22px) 0 0;
  font-size: 17px;
  line-height: 1.9;
  color: var(--stone);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-hero__facts li {
  background: var(--mist);
  padding: 14px clamp(14px, 2vw, 20px);
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.page-about .about-hero__facts b {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.1;
  color: var(--gold-deep);
  letter-spacing: -0.01em;
}

.page-about .about-hero__facts span {
  font-family: var(--font-ui);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

.page-about .about-hero .about-figure--hero {
  border-radius: var(--r-lg);
}

/* ---------- 通用图 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--mist);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure__cap {
  padding: 10px clamp(14px, 2vw, 18px);
  border-top: 1px solid var(--line);
  font-family: var(--font-ui);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: var(--stone);
  background: var(--cream);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  align-items: start;
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-block: clamp(30px, 4.6vw, 54px);
  border-top: 1px solid var(--line);
}

.page-about .about-section--first {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-flow > .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

/* ---------- 我们做什么 ---------- */
.page-about .about-intro {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-intro .prose p {
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.9;
  color: var(--stone);
  max-width: 36em;
}

.page-about .about-intro .prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-fit {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-fit__item {
  border-left: 3px solid var(--moss);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--mist);
  padding: 14px 18px;
  transition: border-color 0.26s ease, transform 0.26s ease;
}

.page-about .about-fit__item:hover {
  border-left-color: var(--gold);
  transform: translateX(4px);
}

.page-about .about-fit__label {
  margin: 0 0 5px;
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--grass);
}

.page-about .about-fit__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0 0 0 var(--about-tl-pad);
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: calc(var(--about-tl-axis) - 1px);
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--grass) 0%, var(--sky) 58%, var(--gold) 100%);
  opacity: 0.7;
}

.page-about .about-timeline__item {
  position: relative;
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-about .about-timeline__item:last-child {
  margin-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 26px;
  left: calc(var(--about-tl-axis) - var(--about-tl-pad) - 6px);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--cream);
  border: 3px solid var(--grass);
  box-sizing: border-box;
  transition: border-color 0.26s ease, background-color 0.26s ease;
}

.page-about .about-timeline__item:last-child::before {
  border-color: var(--gold);
  background: var(--gold-soft);
}

.page-about .about-timeline__item:hover::before {
  border-color: var(--sky);
  background: var(--sky);
}

.page-about .about-timeline__card {
  width: var(--about-card-w, 100%);
  max-width: 100%;
  box-sizing: border-box;
  background: var(--mist);
  border: 1px solid var(--line);
  border-left: 3px solid var(--grass);
  border-radius: var(--r-md);
  padding: clamp(15px, 2.2vw, 24px) clamp(15px, 2.2vw, 26px);
  transition: transform 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease;
}

.page-about .about-timeline__card:hover {
  transform: translateX(5px);
  border-left-color: var(--gold);
  box-shadow: var(--shadow-soft);
}

.page-about .about-timeline__stage {
  display: flex;
  align-items: baseline;
  gap: 9px;
  margin: 0 0 8px;
  font-family: var(--font-ui);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--grass);
}

.page-about .about-timeline__num {
  font-family: var(--font-body);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--gold-deep);
}

.page-about .about-timeline__title {
  margin: 0 0 9px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2.2vw, 23px);
  line-height: 1.42;
  letter-spacing: -0.01em;
  color: var(--lake);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.88;
  color: var(--stone);
}

.page-about .about-timeline__meta {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line-strong);
  font-family: var(--font-ui);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--clay);
  opacity: 0.78;
  transition: opacity 0.26s ease;
}

.page-about .about-timeline__card:hover .about-timeline__meta {
  opacity: 1;
}

/* ---------- 覆盖版图 ---------- */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 3vw, 32px) 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-metrics li {
  background: var(--cream);
  padding: clamp(14px, 2vw, 20px);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-metrics strong {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1;
  color: var(--sky);
  letter-spacing: -0.02em;
}

.page-about .about-metrics span {
  font-family: var(--font-ui);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--stone);
}

.page-about .about-figure--map {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-regions {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-region {
  background: var(--mist);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: clamp(14px, 2vw, 20px);
  transition: border-color 0.26s ease, background-color 0.26s ease;
}

.page-about .about-region:hover {
  border-color: var(--sky);
  background: var(--cream);
}

.page-about .about-region__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15.5px;
  letter-spacing: 0.01em;
  color: var(--lake);
}

.page-about .about-region__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--stone);
}

/* ---------- 团队 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-split__text .prose p {
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.9;
  color: var(--stone);
  max-width: 36em;
}

.page-about .about-split__text .prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-duties {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-duties li {
  background: var(--cream);
  padding: 13px clamp(14px, 2vw, 18px);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
}

.page-about .about-duties b {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 14.5px;
  color: var(--grass);
  flex: 0 0 auto;
}

.page-about .about-duties span {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 渠道 ---------- */
.page-about .about-channels {
  display: grid;
  gap: 12px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-channel {
  background: var(--mist);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: clamp(15px, 2.2vw, 22px);
  transition: transform 0.26s ease, border-color 0.26s ease;
}

.page-about .about-channel:hover {
  transform: translateY(-2px);
  border-color: var(--gold-soft);
}

.page-about .about-channel .tag {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-ui);
  font-size: 12.5px;
  letter-spacing: 0.06em;
}

.page-about .about-channel__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .about-channels__note {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 14px 18px;
  border-left: 3px solid var(--clay);
  background: var(--cream);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .about-link {
  color: var(--sky);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 127, 184, 0.4);
  padding-bottom: 1px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-link:hover {
  color: var(--gold-deep);
  border-bottom-color: var(--gold);
}

/* ---------- 合规 ---------- */
.page-about .about-compliance {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-compliance .prose p {
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.9;
  color: var(--stone);
  max-width: 36em;
}

.page-about .about-compliance .prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-compliance__box {
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  background: var(--mist);
  padding: clamp(18px, 2.6vw, 26px);
}

.page-about .about-compliance__label {
  margin: 0 0 10px;
  font-family: var(--font-ui);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--clay);
}

.page-about .about-compliance__value {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3vw, 28px);
  letter-spacing: -0.01em;
  color: var(--lake);
}

.page-about .about-compliance__text {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-compliance__box .btn {
  display: inline-block;
  font-family: var(--font-ui);
  text-decoration: none;
}

/* ---------- 运营准则 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 14px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-principle {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--cream);
  padding: clamp(16px, 2.4vw, 24px);
  transition: border-color 0.26s ease, background-color 0.26s ease;
}

.page-about .about-principle:hover {
  border-color: var(--grass);
  background: var(--mist);
}

.page-about .about-principle__num {
  margin: 0 0 6px;
  font-family: var(--font-body);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--gold-soft);
}

.page-about .about-principle__title {
  margin: 0 0 9px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2vw, 20px);
  letter-spacing: -0.01em;
  color: var(--lake);
}

.page-about .about-principle__text {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--stone);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-regions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-channels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-fit {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .page-about .about-timeline__item:nth-child(1) .about-timeline__card {
    --about-card-w: 66%;
  }

  .page-about .about-timeline__item:nth-child(2) .about-timeline__card {
    --about-card-w: 74%;
  }

  .page-about .about-timeline__item:nth-child(3) .about-timeline__card {
    --about-card-w: 83%;
  }

  .page-about .about-timeline__item:nth-child(4) .about-timeline__card {
    --about-card-w: 91%;
  }

  .page-about .about-timeline__item:nth-child(5) .about-timeline__card {
    --about-card-w: 100%;
  }

  .page-about .about-regions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: center;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-compliance {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  }

  .page-about .about-rail {
    position: sticky;
    top: 108px;
  }
}

/* ---------- 侧栏锚点 ---------- */
.page-about .about-rail {
  border-left: 2px solid var(--track);
  padding-left: 16px;
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--clay);
}

.page-about .about-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: about-rail;
}

.page-about .about-rail__list li {
  counter-increment: about-rail;
}

.page-about .about-rail__list a {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-rail__list a::before {
  content: counter(about-rail, decimal-leading-zero) " ";
  color: var(--gold-deep);
  font-size: 12px;
  margin-right: 4px;
}

.page-about .about-rail__list a:hover {
  color: var(--grass);
  border-bottom-color: var(--gold);
  transform: translateX(2px);
}

@media (min-width: 1024px) {
  .page-about .about-rail__list {
    display: block;
  }

  .page-about .about-rail__list li + li {
    margin-top: 13px;
  }

  .page-about .about-rail__list a {
    display: block;
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 479px) {
  .page-about .about-metrics {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-principles {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-timeline {
    --about-tl-pad: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-fit__item,
  .page-about .about-timeline__card,
  .page-about .about-timeline__meta,
  .page-about .about-channel,
  .page-about .about-principle,
  .page-about .about-rail__list a {
    transition: none;
  }
}